Hydrometer



Dec. 3, 1940. I MITCHELL Re. 21,648

HYDROMETER Original Filed Aug. 15; 1936 I lye/22y HM Reissued Dec. 3, 1940 PATENT OFFICE HYDROMETER Henry Walter Mitchell, Chicago, Ill., assignor, by mesne assignments, to Stromberg Motoscope Mtg. 00., a corporation of Illinois Original No. 2,110,450, dated March 8, 1938, Se-

rial No. 96,183, August 15, 1936. Application for reissue January 6, 1940, Serial No. 312,791

12 Claims.

This invention relates to measuring instruments of the hydrometer type and more particularly to a thermohydrometer.

Heretofore, thermometers have been employed in testing liquids with a hydrometer, and the thermometer was attached or built outwardly of the body of the hydrometer.

It is an object of the present invention to combine a thermometer within the usual liquid and float receiving barrel body of a hydrometer for simultaneously testing the specific gravity and temperature of a liquid, and wherein the scale of the thermometer is not contacted by the liquid being tested.

Another object is to provide a thermometer within the usual liquid and float receiving barrel body of the hydrometer, arranged and constructed so as to permit of the passage of the liquid to the upper end of the hydrometer barrel to be checked for specific gravity by float means normally employed in the hydrometer.

A further object is the provision of a unit containing a thermometer which has one end thereof adapted to extend outwardly of the unit and to be contacted by the liquid, when a test is being made, and the stem of which thermometer is aligned with a scale, and the unit being provided with a plurality of passageways, so that, when the unit is positioned within the body of the hydrometer, the stem and scale of the thermometer will be sealed from contact with the liquid being tested, while the liquid is permitted to flow through the passageways of the unit.

And a further object is the provision of a thermometer positioned below the usual float of the hydrometer to record the temperature of the liquid under test immediately upon entering the hydrometer. I

In according with the present invention, it is proposed to frictionally secure the thermometer unit within the usual liquid and float receiving barrel body of the hydrometer below the float thereof whereby the stem of the thermometer and a scale carried to coact therewith will be insulated from contact with the liquid to be tested, and in which unit there is passageway means permitting of the free passage of liquid from the lower portion of the hydrometer to the upper portion thereof. If a liquid is not transparent, it may be readily tested as to its specific gravity and temperature without interfering with the visibility of the thermometer therein.

While I have shown the unit as being frictionally applied within the body of the hydrometer,

it is to be understood that the same may be molded or otherwise retained therein.

Referring to the drawing:

Figure 1 illustrates a longitudinal cross-sectional view of a hydrometer having my invention. applied thereto, and the bulb end and the lower stem of the hydrometer partially in elevation.

Figure 2 is a detail perspective view of the thermometer unit to be applied within the body of m the hydrometer.

Figure 3 is an enlarged detail cross-sectional view taken through the thermometer on the line 33 of Figure 1.

Figure 4 is an enlarged detail cross-sectional 1 view taken through the upper portion of the hydrometer on the line L-l of Figure 1; and

Figure 5 is a detail cross-sectional view taken on the line 55 of Figure 1.

The reference numeral designates the usual transparent tubular liquid and float receiving barrel body portion of the hydrometer, which is provided with the usual suction bulb II at the upper end thereof, and with a liquid receiving spout l2 at the lower end thereof which may also be of usual form. The barrel body portion l0 of the hydrometer carries the usual float I3 therein for testing the specific gravity of the liquid to be tested, and this body portion l0 has a rubber plug M at the upper end thereof that is provided with a plurality of openings Ma therein to permit of the passage of air while the hydrometer is in use, and the plug serving as a stop to limit the upward movement of the float l3.

The thermometer, comprising the subject matter of this invention, arranged and preassembled. as a unitdesignated as a whole as 15, is bodily positioned in the body portion 10 of the hydrometer near the lower end thereof, and the upper end of said unit serves with the plug I4 to limit the vertical movements of the float I3 within the hydrometer.

The unit l5 comprises an upper and lower plug l6 and II, respectively, arranged in spaced relation and having a graduated scale I8 therebetween. The upper and lower plugs I6 and I1 are preferably of resilient material, and are each provided with an opening I9 and 20, which are arranged in aligned relation to receive a stem 2| of a'thermometer 22, having the usual bulb end 23, provided with mercury 24.

The plug I6 is also provided with a pair of openings 25 and 28 which are aligned with a pair of openings 21 and 28 in the lower plug .ll, and which openings are positioned rearwardly of the scale l8 and receive a pair of aligned tubular members 29 and therein, and when positioned, these tubular members 29 and 30 serve with the thermometer stem 2| to retain the scale l8 therebetween and with the indicating portion thereof positioned to be readily readable with the thermometer. Tubular members 29 and 30 are in close proximity with the thermometer to impart the temperature of the liquid to the thermometer.

When the unit is assembled as above described, (Fig. 2), it is then inserted unitarily within the usual transparent tubular liquid and float receiving barrel body portion In of the hydrometer, and the plugs I 6 and I1 thereof serve to seal the same in position with the bulb'end 23 of the thermometer exposed to the liquid.

As a test is being made, the bulb l I is collapsed and the hydrometer is positioned with the spout I2 thereof within the liquid, and as the bulb is released, the suction created thereby will draw into the hydrometer barrel a suflicient amount of liquid to make the test. As the liquid enters into the body portion ID of the hydrometer, it immediately contacts the bulb 23 of the thermometer and is drawn upwardly through the tubular members 29 and 30 into contact with the float I3 positioned above the plug I6 of the unit. When the liquid is within the body portion of the hydrometer, as above described, the indicating portion of the scale I8 and the indicating thermometer stern 2| will be readily visible, as the liquid does not contact the same, and it is then a simple matter to readily determine the degree of temperature of the liquid as well as the specific gravity thereof indicated by the gauge float I contemplate as being included in these improvements all such changes, variations and departures as fall within the scope'of the appended claims.

I claim:

1. In a device of the class described, having a usual tubular transparent liquid and float receiving barrel body and a float arranged for vertical movements therein, of a unit preassembled and arranged as such to fit within said bodybelow the float therein, said unit forming a fluidtight partition in said body, temperature indicating means in said unit having the bulb element projecting beyond said unit for exposure to the fluid under test, passageway means in said unit communicating with the upper and lower ends of said body forming means for the admission of a liquid therethrough to be indicated by the temperature indicating means, and a scale engaged by said passagewaymeans and held in position adjacent to said temperature indicating means.

2. In a device of the class described having a usual tubular transparent liquid and float receivingbarrel body and a float arranged for vertical movements therein, of a unit preassembled and arranged as such to fit within said body below the float therein and comprising spaced fluidtight partition portions invsaid body, said unit comprising temperature indicating means and means providing a plurality of passageways therein communicating with each end of the tubular transparent body, said passageways forming means for conducting a liquid under test in close proximity with the temperature indicating means, and a scale for said thermometer interposed between and held in place by said temperature indicating means and the passageway means.

3. In a hydrometer of the character described,

a usual transparent hydrometer barrel, and a temperature indicating unit insertable in said barrel as a preassembled unitary structure comprising a thermometer having a recording stem and a bulb end thereon and being positioned within and at near the lower end portion of said barrel, and passageway means therearound permitting the flow of liquid therethrough into the barrel, means for sealing the indicating zone of said thermometer from contact with the liquid tested while permitting the bulb end thereof to be contacted thereby, and a scale within the sealed zone and held in place by said passageway means to be read in conjunction with the thermometer.

4. A unit adapted to be positioned within a hydrometer, comprising resilient upper and lower ends, a thermometer having a stem extending through said upper and lower resilient ends, a scale for said thermometer extending between said upper and lower resilient ends, and a plurality of tubular members forming passageways through said unit and serving with said thermometer to retain the scale in position.

5. A temperature indicator arranged as a unit having spaced partitioning elements and adapted to be bodily positioned within the body portion of a hydrometer, comprising, a thermometer supported longitudinally in said unit with the scale portion between said elements, a scale supported in saidunit and adapted to record the temperature subjected to the thermometer, tubular members extending through said unit and forming passageways therethrough, said tubular members being in close proximity with the thermometer to impart the temperature of the liquid thereto and serving to retain the scale in position.

6. In a. device of the class described, having a usual tubular transparent liquid and float receiving barrel body and the usual gauge float arranged for vertical movements therein, of a temperature recording unit preassembled and arranged as a unit to fit within said body below the float therein and forming spaced partitions in said body, said temperature recording unit comprising, a thermometer having a scale coacting therewith, passageway means for a liquid to be tested extending through said unit and in close proximitywith the thermometer, and means at each end of the unit forsealing the same against contact with the liquid to be tested, said passageway means and sealing means holding the scale in indicating Position with respect to the thermometer.

'7. Temperature indicating means adapted for use in a hydrometer preassembled as a unit to be inserted in the liquid barrel of a hydrometer as a unit, comprising, a thermometer, partitioning means for supporting said thermometer substantially centrally of the body of the hydrometer at near one end thereof with the scale thereof between said partitioning means, and passageway means extending parallel with and in close proximity with the thermometer and communicating with the upper and lower ends of the hydrometer forming means for a liquid to be tested to pass said thermometer, while being drawn into the upper end of the hydrometer, said passageway means and partitioning means serving to retain thescale in position.

8. In a device of the class described, having a usual tubular transparent liquid and float receiving barrel body and the usual gauge float arranged for vertical movements therein, of a temperature recording unit having spaced partitioning elements arranged to fit within said body below the float therein and to form a liquidtight partition in said body, said unit having the parts thereof preassembled and being insertable unitarily in said transparent barrel body, said temperature recording unit com-prising a thermometer having a scale coacting therewith, and a plurality of passageways extending between said partitioning elements and communicating with the upper and lower ends of said tubular body forming means for the admission of a liquid therethrough from the lower portion of said body to the upper portion thereof to be indicated by the temperature recording means, said passageways serving with said thermometer to retain the scale in place.

9. A temperature indicating means adapted to be positioned within the usual barrel of a hydrometer, comprising, a unit preassembled as such to be positioned unitarily in the barrel having spaced partitioning elements and a thermometer and scale therebetween, and tubular members extending through said partitioning elements forming passageways through which a liquid drawn within the hydrometer may pass to the upper portion thereof, said passageways being arranged to guide the liquid in close proximity with the thermometer to indicate the temperature thereof, the barrel of the hydrometer forming a shield to protect the thermometer from atmospheric changes and said tubular members serving to retain the scale in position.

10. A unit adapted to be positioned within a hydrometer comprising resilient upper and lower ends, a thermometer having an indicating stem extending between said upper and lower resilient ends and having a temperature responsive portion exposed therebeyond, tube-like passageway means extending between said upper and lower resilient ends and forming passageway openings through said unit, and a scale for said thermometer, and said tube-like passageway means serving to retain said scale in position adjacent to the indicating stem.

11. A temperature indicator arranged as a unit having spaced partitioning elements and adapted as a preassembled unit to be bodily and unitarily positioned within the body portion of a hydrometer comprising, a thermometer supported longitudinally within said unit with the indicating portion between said elements, a scale supported by-said unit and adapted to indicate the temperature subjected to the thermometer, and tubelike passageway means extending between said spaced partitioning elements and forming passageway means through said unit, said tube-like means serving with said thermometer indicating portion to retain the scale in position.

12. In a'device of the class described, a hydrometer having a usual tubular transparentliquid and float receiving barrel body and the usual gauge float arranged for vertical movement therein, the combination of a temperature recording unit having spaced resilient partitioning portions arranged to fit within said body below the float therein and to form a liquid-tight partition in said body, said unit having the parts thereof preassembled and being insertable unitarily in said transparent barrel body, said temperature recording unit comprising a thermometer having a scale coacting therewith, and tube-like passageway means extending between said partitioning portions and communicating with the upper and lower ends of said tubular body forming means for the admission of liquid therethrough from the lower portion of said body to the upper portion thereof, and said thermometer having a temperature responsive portion exposed for indicating the temperature of the liquid, said tube-like passageway means serving to retain the scale in position with respect to the thermometer.

HENRY WALTER MI'ICHEIL. 

